RaahUPSC · File & Data Tools
CSV to JSON Converter
Produce a clean JSON array from CSV data, with each row as an object keyed by the header row. Ideal for feeding spreadsheets into web apps, scripts and APIs.
✓ No upload · ✓ No sign-up · ✓ No watermark
How to use CSV to JSON Converter
- Add a .csv, .tsv or .txt file (several are allowed).
- Click Convert to JSON.
- Copy the pretty-printed JSON from the result box or download it as a .json file.
How rows map to JSON
The first line supplies the keys. Every following non-empty line becomes an object like {"Name": "Asha", "Marks": 142}. Type detection is applied: numerals become JSON numbers, TRUE and FALSE become booleans, empty cells become null and dates stay exactly as written. Output is indented with two spaces for readability.
Developers building a quiz, mock-test scorer or dashboard often keep content in a spreadsheet; exporting to CSV and converting here gives JSON that JavaScript can use directly.
Limitations
- Values with leading zeros (0045), a leading + (+91...) or more than 15 digits stay as text, so roll numbers, PIN codes and phone numbers are not altered.
- The output is always a flat array of objects; nested structures cannot be built from column names.
- Duplicate header names collide, so give every column a unique heading.
Frequently asked questions
Which delimiters are supported?
Comma, semicolon, tab and pipe are detected automatically.
Why are some values null?
Empty cells become null in the JSON so that missing data is explicit.
Can I convert a large CSV?
Yes, within your browser's memory. Results over about 400,000 characters skip the preview box and go straight to a download button.
Is my data sent anywhere?
No. Parsing and conversion happen in the page itself.